The morphology of the infrared (11?) emission and the properties of discrctc far-infrared (10 R) sources in M31 disk are studied using the high resolution (I IiRes) maps fro]n 1 RAS. Very thin and bright FIR. arm segments are shown ill tllmc maps, which have similar structure as the 111 gas but with much c]lhanccd arn]/inter-arm contrast, typically a factor of N 5 on the 60pTrL image. We identi...

ABSTRACT The timing argument connects the motion of a two-body system to its mass in an expanding Universe with finite age, under assumption that it has evolved on self-gravitating orbit. It is commonly applied present-day Milky Way (MW)–M31 order infer unknown from measured kinematics. We use set Local Group analogues uchuu simulation investigate over cosmic time. find median inferred remains ...

We present the results of the systematic survey of X-ray sources in the central region of M31 using the data from XMM-Newton observations performed in the years 2000-2004. The spectral properties and variability of 123 bright X-ray sources with apparent luminosities between ∼ 1036 and 5×1038 ergs s−1 were studied in detail. The spectral properties of majority of sources in our sample have been ...